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Subject: Re: [OMPI users] busy waiting and oversubscriptions
From: Jeff Squyres (jsquyres) (jsquyres_at_[hidden])
Date: 2014-03-26 08:02:04


On Mar 26, 2014, at 6:45 AM, Andreas Schäfer <gentryx_at_[hidden]> wrote:

>> 1. There is a fundamental difference between disabling
>> hyperthreading in the BIOS at power-on time and simply running one
>> MPI process per core. Disabling HT at power-on allocates more
>> hardware resources to the remaining HT that is left is each core
>> (e.g., deeper queues).
>
> Oh, I didn't know that. That's interesting! Do you have any links with
> in-depth info on that?

Not offhand, no. But I'm quite sure it's well-documented in the Intel docs.

-- 
Jeff Squyres
jsquyres_at_[hidden]
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